• Precisely controls over-revving and launch RPM• Designed for the odd firing angle of Harley V-Twin• Over-rev limit guarantees against damage due to missed shifts or drive train breakage; adjustable from 5500 to 9250 RPM• Launch limit gives maximum off-the-line performance; adjusts between 2500 and 6250 RPM in 250 rpm increments• Spares unnecessary poundings of expressive engine components